如何使用Java的JSCH库连接到SSH服务器？

import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;

public class SSHConnection {

    public static void main(String[] args) throws Exception {
        // SSH server hostname
        String hostname = "example.com";
        // SSH server port
        int port = 22;
        // SSH username
        String username = "username";
        // SSH password
        String password = "password";

        JSch jsch = new JSch();

        // Create a new SSH session
        Session session = jsch.getSession(username, hostname, port);
        session.setPassword(password);

        // Connect to the SSH server
        session.connect();

        // SSH command execution (optional)
        // Execute a remote command on the server
        String command = "ls -l";
        String result = session.execCommand(command).getStdOut();
        System.out.println(result);

        // Disconnect from the SSH server
        session.disconnect();
    }
}